CN115784163B - Terminal judgment method for sodium hypochlorite production by caustic soda chlorination process - Google Patents
Terminal judgment method for sodium hypochlorite production by caustic soda chlorination process Download PDFInfo
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- CN115784163B CN115784163B CN202211582166.XA CN202211582166A CN115784163B CN 115784163 B CN115784163 B CN 115784163B CN 202211582166 A CN202211582166 A CN 202211582166A CN 115784163 B CN115784163 B CN 115784163B
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 title claims abstract description 111
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 239000005708 Sodium hypochlorite Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 39
- 235000011121 sodium hydroxide Nutrition 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000005660 chlorination reaction Methods 0.000 title claims abstract description 14
- 239000000460 chlorine Substances 0.000 claims abstract description 102
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 101
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 101
- 238000006243 chemical reaction Methods 0.000 claims abstract description 95
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 239000003513 alkali Substances 0.000 claims abstract description 22
- 230000000630 rising effect Effects 0.000 claims abstract description 8
- 238000010521 absorption reaction Methods 0.000 claims abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 claims description 5
- -1 hydrogen ions Chemical class 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 238000005070 sampling Methods 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 235000011194 food seasoning agent Nutrition 0.000 description 1
- 239000012458 free base Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Inorganic materials Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
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- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The invention discloses a method for judging the end point of sodium hypochlorite produced by a caustic soda chlorination method, which comprises the following steps: preparing a dilute NaOH solution with target concentration according to a production task, and adding the dilute NaOH solution into a reaction tank; starting a pump to circulate the dilute NaOH solution in the reaction tank through a venturi tube and generating negative pressure; opening a valve for introducing chlorine, introducing the chlorine with stable flow into the venturi tube, and carrying out mixed absorption reaction on the chlorine and dilute NaOH solution in the venturi tube to generate sodium hypochlorite which falls into a reaction tank; and comprehensively judging whether the reaction for producing sodium hypochlorite in the reaction tank reaches the end point according to the rising amount of the liquid level in the reaction tank, the potential value and the total amount of the introduced chlorine. The method comprehensively judges the reaction end point of sodium hypochlorite production from the amount of the introduced chlorine, the potential value and the liquid level increment, can effectively improve the quality of the produced sodium hypochlorite, can more accurately control the amount of alkali and chlorine, controls the production cost and realizes the automatic production of the sodium hypochlorite.
Description
Technical Field
The invention relates to the technical field of sodium hypochlorite industrial production, in particular to a terminal judgment method for sodium hypochlorite production by a caustic soda chlorination method.
Background
The chlorine alkali industry generally adopts a seasoning tower to produce sodium hypochlorite, and the main mass of the sodium hypochlorite requires 0.1% -1% of free alkali concentration, and the effective chlorine concentration is more than 5%, more than 10% and more than 13%, wherein the free alkali index concentration is the reaction NaOH+Cl 2 ＝NaClO+NaCl+H 2 Criteria for reaching the endpoint for O (caustic soda solution chlorination process). The direct control parameter of sodium hypochlorite produced by caustic soda solution chlorination method is the remained sodium hydroxide solute, when the mass fraction of sodium hydroxide solute in the reaction system is 0.1% -1%, the sodium hydroxide solute can be regarded as the reaction reaching the end point, if chlorine is continuously introduced, the over-chlorination reaction will occurThe balance moves reversely, the chlorine cannot be absorbed by the solution, the solution is acidic, hypochlorite ions in the solution are changed into chlorine to diffuse to gas phase, and safety and environmental protection accidents are caused.
In order to determine whether the chemical reaction reaches the end point, two main types of distinguishing methods exist in the industry: and directly judging a reaction end point method and manually sampling and analyzing.
Direct determination of the reaction endpoint: in the process of continuously introducing chlorine in the reaction, the concentration of the free alkali in the sodium hypochlorite solution is obtained, and the free alkali concentration is obtained by adopting a mode of additionally arranging a free alkali on-line monitoring instrument or manually sampling and analyzing in the industry. The free alkali on-line monitoring can directly monitor the concentration of the free alkali in the reaction system, the concentration of the free alkali which can be clearly reacted after debugging, the cost of the free alkali on-line monitoring instrument on the market is about 40 ten thousand yuan, and the instrument investment cost is too high.
Manual sampling analysis: in order to ensure that the reaction does not cause chlorination, a post operator generally informs a laboratory of sampling analysis according to experience, generally judges the reaction progress of the concentration of the free alkali to be 2% -3% according to the experience of the operator, firstly samples and analyzes, closes the chlorine gas inlet amount, empirically judges 0.1% -1% of the free alkali, secondly samples and analyzes, and closes the chlorine gas; if the sample is not qualified, the small-gas-amount chlorine is opened to continue the reaction, and the laboratory is notified of the third sampling analysis, and the like. Because the industrial production process is influenced by various factors, the experience judgment of operators has deviation, the quality of the product can be qualified only through multiple sampling analysis, the experience judgment is only suitable for producing sodium hypochlorite products with the same concentration, if the concentration control of the added raw materials is unstable, the manual experience judgment loses accuracy, and the manual sampling analysis can only be performed, so that the operation intensity of the operators is increased.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for judging the end point of sodium hypochlorite production by a caustic soda chlorination method, which realizes automatic production of sodium hypochlorite.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
the end point judging method for sodium hypochlorite production by caustic soda chlorination method comprises the following steps:
s1: preparing dilute NaOH solution with target concentration according to production tasks, adding the dilute NaOH solution into a reaction tank through a quick-opening valve, and collecting the initial liquid level H of the reaction tank by a liquid level sensor 1 ；
S2: starting a pump to circulate the dilute NaOH solution in the reaction tank through a venturi tube and generating negative pressure;
s3: opening a valve for introducing chlorine, introducing the chlorine with stable flow into the venturi tube, and carrying out mixed absorption reaction on the chlorine and dilute NaOH solution in the venturi tube to generate sodium hypochlorite which falls into a reaction tank;
s4: comprehensively judging whether the reaction for producing sodium hypochlorite in the reaction tank reaches an end point according to the rising amount of the liquid level in the reaction tank, the potential value and the total amount of the introduced chlorine, if so, entering a step S5, otherwise, continuing the reaction;
s5: after the reaction reaches the end point, closing a valve for introducing chlorine, opening a valve for introducing nitrogen into the venturi tube, and introducing nitrogen into the venturi tube to prevent the sodium hypochlorite from being sucked backwards;
s6: after the reaction is completed, a pump is started to pour the sodium hypochlorite finished product into a finished product tank.
Further, step S4 includes:
s41: along with the continuous introduction of the chlorine, calculating the total amount L of the introduced chlorine according to the chlorine flow L recorded by a chlorine flow sensor and the time t of introducing the chlorine: l=l×t;
s42: calculating the total amount L' of chlorine required under the theory according to the total amount of the dilute NaOH solution with the target concentration prepared in the step S1;
s43: judging the total amount L of the introduced chlorine and the total amount L' of the chlorine required under the theoretical condition:
if L is less than L', judging that the reaction for producing sodium hypochlorite does not reach the end point, and continuing to introduce chlorine;
if L is more than or equal to L', judging that the reaction for producing sodium hypochlorite possibly reaches the end point, and calculating and introducing chlorineThe difference DeltaL between the total amount L of (C) and the total amount L' of chlorine required under theoretical conditions: Δl=l-L'; the difference delta L is compared with the fluctuation delta L allowed by chlorine Wave motion Comparison is performed:
if DeltaL > DeltaL Wave motion Closing the valve for introducing chlorine, and stopping introducing the chlorine; if DeltaL is less than or equal to DeltaL Wave motion Then, chlorine can be continuously introduced, and the step S44 is executed;
s44: the liquid level sensor collects the liquid level H in the reaction tank at the moment 2 Calculating the rising amount delta H of the liquid level in the reaction tank in the process of generating sodium hypochlorite: Δh=h 2 -H 1 ；
Comparing the amount of liquid level rise ΔH with the ideal value of liquid level rise ΔH Ideal for Comparing; if DeltaH is greater than or equal to DeltaH Ideal for Judging that the reaction of the sodium hypochlorite produced at the time reaches the end point, and closing a valve for introducing chlorine; if DeltaH < DeltaH Ideal for Determining that the reaction for producing sodium hypochlorite may reach the end point, and executing step S45;
s45: measuring the potential value d in the reaction tank by using a Nernst potentiometer 1 Calculating the free alkali content a in the sodium hypochlorite by utilizing a theoretical material balance formula according to the total amount L of the introduced chlorine and the amount of the diluted NaOH solution with the prepared target concentration OH- ；
Estimating theoretical potential d in potential sodium hypochlorite using Nernst equation Estimation ：d Estimation ＝K-0.0592lga H+ The method comprises the steps of carrying out a first treatment on the surface of the Wherein a is H+ Is the content of hydrogen ions in sodium hypochlorite, a H+ ＝a OH- K is a standard potential value;
will have a potential value d 1 And theoretical potential d Estimation Taking the difference, the potential fluctuation value delta d is obtained: Δd= |d Estimation -d 1 |；
If Δd is less than or equal to Δd Threshold value Judging that the reaction of the sodium hypochlorite produced at the time reaches the end point, closing a valve for introducing chlorine, and executing the step S5; if Δd > Δd Threshold value If it is determined that the reaction of the sodium hypochlorite produced at this time has not reached the end point, chlorine gas may be continuously introduced, and the process returns to step S41, Δd Threshold value Allowing for the end of the sodium hypochlorite production reactionThe allowable potential value fluctuates by a threshold value.
The beneficial effects of the invention are as follows: according to the invention, the reaction end point of sodium hypochlorite production is comprehensively judged from the amount of the introduced chlorine, the potential value and the liquid level increment, the misjudgment is avoided while the complete effect of the reaction is ensured, whether the reaction reaches the end point or not can be monitored in real time in the process of introducing the chlorine for reaction, the chlorine is ensured to be disconnected in time after the reaction end point is reached, the quality of the produced sodium hypochlorite can be effectively improved, the amount of alkali and the amount of the chlorine can be more accurately controlled, and the production cost is controlled. In the process of executing the reaction end point judgment, the amount of the introduced chlorine is taken as a reference, the potential value and the liquid level increment are taken as auxiliary criteria, and the requirement of the amount of the chlorine plus the potential value or the amount of the chlorine plus the liquid level increment can be taken as the judgment basis for the reaction to reach the end point as long as the requirement is met, and the reaction end point is flexible to control and high in precision.
Drawings
FIG. 1 is a flow chart of a method for determining the end point of sodium hypochlorite production by caustic chlorination.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.
As shown in fig. 1, the method for judging the end point of sodium hypochlorite production by the caustic soda chlorination process in the scheme comprises the following steps:
s1: preparing dilute NaOH solution with target concentration according to production tasks, adding the dilute NaOH solution into a reaction tank through a quick-opening valve, and collecting the initial liquid level H of the reaction tank by a liquid level sensor 1 ；
S2: starting a pump to circulate the dilute NaOH solution in the reaction tank through a venturi tube and generating negative pressure;
s3: opening a valve for introducing chlorine, introducing the chlorine with stable flow into the venturi tube, and carrying out mixed absorption reaction on the chlorine and dilute NaOH solution in the venturi tube to generate sodium hypochlorite which falls into a reaction tank;
s4: comprehensively judging whether the reaction for producing sodium hypochlorite in the reaction tank reaches an end point according to the rising amount of the liquid level in the reaction tank, the potential value and the total amount of the introduced chlorine, if so, entering a step S5, otherwise, continuing the reaction; the step S4 specifically comprises the following steps:
s41: along with the continuous introduction of the chlorine, calculating the total amount L of the introduced chlorine according to the chlorine flow L recorded by a chlorine flow sensor and the time t of introducing the chlorine: l=l×t;
s42: calculating the total amount L' of chlorine required under the theory according to the total amount of the dilute NaOH solution with the target concentration prepared in the step S1;
s43: judging the total amount L of the introduced chlorine and the total amount L' of the chlorine required under the theoretical condition:
if L is less than L', judging that the reaction for producing sodium hypochlorite does not reach the end point, and continuing to introduce chlorine;
if L is more than or equal to L ', judging that the reaction for producing sodium hypochlorite possibly reaches the end point, and calculating the difference delta L between the total amount L of the introduced chlorine and the total amount L' of the chlorine required under the theoretical condition: Δl=l-L'; the difference delta L is compared with the fluctuation delta L allowed by chlorine Wave motion Comparison is performed:
if DeltaL > DeltaL Wave motion Closing the valve for introducing chlorine, and stopping introducing the chlorine; if DeltaL is less than or equal to DeltaL Wave motion Then, chlorine can be continuously introduced, and the step S44 is executed;
s44: the liquid level sensor collects the liquid level H in the reaction tank at the moment 2 Calculating the rising amount delta H of the liquid level in the reaction tank in the process of generating sodium hypochlorite: Δh=h 2 -H 1 ；
Comparing the amount of liquid level rise ΔH with the ideal value of liquid level rise ΔH Ideal for Comparing; if DeltaH is greater than or equal to DeltaH Ideal for Judging that the reaction of the sodium hypochlorite produced at the time reaches the end point, and closing a valve for introducing chlorine; if DeltaH < DeltaH Ideal for Determining that the reaction for producing sodium hypochlorite may reach the end point, and executing step S45;
s45: measuring the potential value d in the reaction tank by using a Nernst potentiometer 1 Calculating the free alkali content a in the sodium hypochlorite by utilizing a theoretical material balance formula according to the total amount L of the introduced chlorine and the amount of the diluted NaOH solution with the prepared target concentration OH- ；
Estimating theoretical potential d in potential sodium hypochlorite using Nernst equation Estimation ：d Estimation ＝K-0.0592lga H+ The method comprises the steps of carrying out a first treatment on the surface of the Wherein a is H+ Is the content of hydrogen ions in sodium hypochlorite, a H+ ＝a OH- K is a standard potential value;
will have a potential value d 1 And theoretical potential d Estimation Taking the difference, the potential fluctuation value delta d is obtained: Δd= |d Estimation -d 1 |；
If Δd is less than or equal to Δd Threshold value Judging that the reaction of the sodium hypochlorite produced at the time reaches the end point, closing a valve for introducing chlorine, and executing the step S5; if Δd > Δd Threshold value If it is determined that the reaction of the sodium hypochlorite produced at this time has not reached the end point, chlorine gas may be continuously introduced, and the process returns to step S41, Δd Threshold value The threshold value of the fluctuation of the potential value allowed at the end point of the sodium hypochlorite production reaction is set.
S5: after the reaction reaches the end point, closing a valve for introducing chlorine, opening a valve for introducing nitrogen into the venturi tube, and introducing nitrogen into the venturi tube to prevent the sodium hypochlorite from being sucked backwards;
s6: after the reaction is completed, a pump is started to pour the sodium hypochlorite finished product into a finished product tank.
According to the invention, the reaction end point of sodium hypochlorite production is comprehensively judged from the amount of the introduced chlorine, the potential value and the liquid level increment, the misjudgment is avoided while the complete effect of the reaction is ensured, whether the reaction reaches the end point or not can be monitored in real time in the process of introducing the chlorine for reaction, the chlorine is ensured to be disconnected in time after the reaction end point is reached, the quality of the produced sodium hypochlorite can be effectively improved, the amount of alkali and the amount of the chlorine can be more accurately controlled, and the production cost is controlled. In the process of executing the reaction end point judgment, the amount of the introduced chlorine is taken as a reference, the potential value and the liquid level increment are taken as auxiliary criteria, and the requirement of the amount of the chlorine plus the potential value or the amount of the chlorine plus the liquid level increment can be taken as the judgment basis for the reaction to reach the end point as long as the requirement is met, and the reaction end point is flexible to control and high in precision.
In this embodiment, taking the end point judging method for producing sodium hypochlorite by using the caustic soda chlorination method as an example, the validity of the sodium hypochlorite producing process is demonstrated according to the actual production data:
(1) chlorine accumulation index
Initially: the mass of the dilute alkali solution is 18.8 tons, and the concentration of the alkali is 13.5 percent.
Reaction end point: the chlorine flow was predicted to be 532.8m3, the free base concentration 0.87% and the available chlorine concentration 10.51%. The mass balance table 1 is listed as shown in table 1 below:
table 1 material balance data table
As a result of actual assay, the free alkali is 0.99%, the available chlorine is 10.21%, the chlorine is added up to 537.17m < 3 >, the reaction time is 2.4h, and the difference from the theoretical calculation result is small.
(2) Potential value index
According to the theoretical material balance formula, the end point value free alkali is 0.87%, the potential is estimated by adopting a Nernst equation, and d Estimation ＝K-0.0592lga H+ ，d Estimation Actual result 529 mv= 518.87 mv. The endpoint potential for the actual process is shown in table 2 below:
TABLE 2ORP potential values and end-point test results Table
As is clear from Table 2, the reaction end point potential value was about 520mv, and the potential fluctuation was not large.
(3) Indicator of liquid level value
According to the production data, the liquid level rises by 5% -10%, the initial liquid level is 70.39%, and the final liquid level is 80.12%. The end point control index is set as the liquid level 80%, the potential value index is 520mv, and the chlorine cumulative value is 532.8m3.
Table 3 liquid level rising data table
As shown in Table 3 above, the liquid level rise range was 5% to 7.9%. The control parameter summary table is shown in table 4 below:
TABLE 4 production control index summary table
Claims (1)
1. The end point judging method for sodium hypochlorite production by caustic soda chlorination method is characterized by comprising the following steps:
s1: preparing dilute NaOH solution with target concentration according to production tasks, adding the dilute NaOH solution into a reaction tank through a quick-opening valve, and collecting the initial liquid level H of the reaction tank by a liquid level sensor 1 ；
S2: starting a pump to circulate the dilute NaOH solution in the reaction tank through a venturi tube and generating negative pressure;
s3: opening a valve for introducing chlorine, introducing the chlorine with stable flow into the venturi tube, and carrying out mixed absorption reaction on the chlorine and dilute NaOH solution in the venturi tube to generate sodium hypochlorite which falls into a reaction tank;
s4: comprehensively judging whether the reaction for producing sodium hypochlorite in the reaction tank reaches an end point according to the rising amount of the liquid level in the reaction tank, the potential value and the total amount of the introduced chlorine, if so, entering a step S5, otherwise, continuing the reaction;
s5: after the reaction reaches the end point, closing a valve for introducing chlorine, opening a valve for introducing nitrogen into the venturi tube, and introducing nitrogen into the venturi tube to prevent the sodium hypochlorite from being sucked backwards;
s6: after the reaction is finished, a pump is started to pour sodium hypochlorite finished products into a finished product tank;
the step S4 includes:
s41: along with the continuous introduction of the chlorine, calculating the total amount L of the introduced chlorine according to the chlorine flow L recorded by a chlorine flow sensor and the time t of introducing the chlorine: l=l×t;
s42: calculating the total amount L' of chlorine required under the theory according to the total amount of the dilute NaOH solution with the target concentration prepared in the step S1;
s43: judging the total amount L of the introduced chlorine and the total amount L' of the chlorine required under the theoretical condition:
if L is less than L', judging that the reaction for producing sodium hypochlorite does not reach the end point, and continuing to introduce chlorine;
if L is more than or equal to L ', judging that the reaction for producing sodium hypochlorite possibly reaches the end point, and calculating the difference delta L between the total amount L of the introduced chlorine and the total amount L' of the chlorine required under the theoretical condition: Δl=l-L'; the difference delta L is compared with the fluctuation delta L allowed by chlorine Wave motion Comparison is performed:
if DeltaL > DeltaL Wave motion Closing the valve for introducing chlorine, and stopping introducing the chlorine; if DeltaL is less than or equal to DeltaL Wave motion Then, chlorine can be continuously introduced, and the step S44 is executed;
s44: the liquid level sensor collects the liquid level H in the reaction tank at the moment 2 Calculating the rising amount delta H of the liquid level in the reaction tank in the process of generating sodium hypochlorite: Δh=h 2 -H 1 ；
Comparing the amount of liquid level rise ΔH with the ideal value of liquid level rise ΔH Ideal for Comparing; if DeltaH is greater than or equal to DeltaH Ideal for Judging that the reaction of the sodium hypochlorite produced at the time reaches the end point, and closing a valve for introducing chlorine; if DeltaH < DeltaH Ideal for Determining that the reaction for producing sodium hypochlorite may reach the end point, and executing step S45;
s45: measuring the potential value d in the reaction tank by using a Nernst potentiometer 1 The total amount L of the introduced chlorine and the amount of the diluted NaOH solution with the prepared target concentration are calculated by utilizing theoretical materialsFormula (a) calculating the free alkali content of sodium hypochlorite OH- ；
Estimating theoretical potential d in potential sodium hypochlorite using Nernst equation Estimation ：d Estimation ＝K-0.0592lga H+ The method comprises the steps of carrying out a first treatment on the surface of the Wherein a is H+ Is the content of hydrogen ions in sodium hypochlorite, a H+ ＝a OH- K is a standard potential value;
will have a potential value d 1 And theoretical potential d Estimation Taking the difference, the potential fluctuation value delta d is obtained: Δd= |d Estimation -d 1 |；
If Δd is less than or equal to Δd Threshold value Judging that the reaction of the sodium hypochlorite produced at the time reaches the end point, closing a valve for introducing chlorine, and executing the step S5; if Δd > Δd Threshold value If it is determined that the reaction of the sodium hypochlorite produced at this time has not reached the end point, chlorine gas may be continuously introduced, and the process returns to step S41, Δd Threshold value The threshold value of the fluctuation of the potential value allowed at the end point of the sodium hypochlorite production reaction is set.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101226640B1 (en) * | 2012-08-14 | 2013-01-25 | 주식회사 제이텍 | Device for generating high-concentrated sodium hypochlorite |
| CN103241713A (en) * | 2013-05-15 | 2013-08-14 | 乳源东阳光电化厂 | Preparation method of sodium hypochlorite |
| WO2018026260A1 (en) * | 2016-08-05 | 2018-02-08 | Cheng Chew Kong | System and method for recovering sodium hypochlorite from exhaust chlorine gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101226640B1 (en) * | 2012-08-14 | 2013-01-25 | 주식회사 제이텍 | Device for generating high-concentrated sodium hypochlorite |
| CN103241713A (en) * | 2013-05-15 | 2013-08-14 | 乳源东阳光电化厂 | Preparation method of sodium hypochlorite |
| WO2018026260A1 (en) * | 2016-08-05 | 2018-02-08 | Cheng Chew Kong | System and method for recovering sodium hypochlorite from exhaust chlorine gas |
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